A museums-and-culture department CE begins advertising a recursive…

Question

A museums-and-culture department CE begins advertising a recursive default into the VRF and black-holes civic traffic. What PE-CE hygiene best stops that behavior?

Accepted Answer

Apply inbound prefix filtering (or a well-known BGP community discard policy) on the PE so unwanted defaults and recursive routes from the CE are rejected — A recursive default from a CE is a trapdoor under the VRF — traffic falls in and disappears. Filter on the PE inbound from that CE so junk defaults never land. Killing LSPs or juggling OSPF network types misses the actual hygiene point: do not accept bad routes from the CE.

Answer

Delete the transport LSP to that PE so the default cannot be label-switched

Answer

Force the CE into OSPF broadcast mode so defaults are automatically ignored

Answer

Set identical export RTs on every museum VRF so defaults are overwritten by full-mesh routes

A museums-and-culture department CE begins advertising a recursive default into the VRF and black-holes civic traffic. What PE-CE hygiene best stops that behavior?

Short Explanation

Full Explanation